Process of preparing colored goggles.



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PEQCESSI OF PREPARING COLURED GOGGLES.

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' To all whom it may concern Be it known that T, JOHN U. BARR, a citizenof the United States, and a resident of the city of New York, county ofNew York,

and State of New .Yorln'have invented certain new and usefulImprovements in Processes for Preparing Colored Goggles, of

a which the following is a specification.

My invention relates to an improvement in the art of preparing one-piecetransparent goggle glasses and lenses having portions thereof withdifi'erent degrees of colored transparency.

The manufacture of colored automobile goggles has heretofore beenattained with much dificulty for it has been practically impossible tocoat these glasses economically without showing streaks, cloudy effectson some portions thereof, and even the micromistic specks of the coatingmaterial become. unpleasant and develop an eye fatigue after gogglesequipped with such glasses have been, worn for awhile. Defects in theuniformity of coating which when viewed by reflected light are not atall apparent, become quite disagreeable when viewed by means of strongtransmitted light, such as the sun passing through" the colored glass tothe wearers eyes.

Une of the-objects of my invention is to produce economically a cleartransparent coated glass-for use as a goggle glass which will be free ofthe above sug ested objections and portionsofwhich wi 1 be as clear ofclouds and other defects as if this coated portion were constructed ofglass with the coloring matter chemically combined there with. T attainthis object broadly by forceibly depositing a film of pigment on theglass with the pigment element of the deositing stream so finely dividedand diuted by the air present as to lose its character as solid matter,simultaneously sub jecting the glass to the action of a strong aircurrent at room temperature and finally.

' f ifir ingqthe film of pigments by a burning process;

' flGlasawhichmaybe amber, blue or colorj less stock usually-used ingoggles is first cut slid toas li p @ne side of the shaped glass iscleane {preferably with alcohol, to free the -'.;same ftorn greaseacidand other stains lt tilt ande ssas inate;anaportions col? 1Specification of Letters Patent. Pajmgnfl ggd W gg M3311 Applicationfiled August 11,

1915. Serial Ito. 44,947.

ored and sometimes to make the colored port ons of different densitiesas disclosed in my Patent No. 1,067,793, July 22, 1913. In order toprevent any deposit of the coloring the following pigment-depositingstep.

The glass to be coated is held in front of the operator and transverselyof a strong current of air which subjects the glass to a rapid airdrying operation during the deposit of pigment. This action may be advantageously attained by the operator workpigments upon the clearportion, this portion is covered by a pattern of suitable form. Thepattern is designed to fit close to. the

ing at the mouth of a horizontally disposed hood in which the air isdrawn by a fan. This has the additional advantage, if not necessitv, ofdrawing the spray hereinafter described away from the operator and in adirection to deposit the same on the glass.

Starting from one side of the surface to be treated the operator directsa blast of extremely attenuated colored liquid pigment uniformly acrossthe face of the glass. lit is of the utmost importance that thepigmentsbe finely divided so fine in fact that the best results are attainedonly when the particles are practically invisible and blown directly onthe glass at relatively high velocity. The pigment is preferably any ofthe fine ground metallic colors usually employed in such process,thinned out to a consistency about that of thin milk and strained toremove any lumps, however, small. The

must be less than the force which would pre- 7 vent the film of pigmentfrom adhering to the glass surface. It has been found in prae tioe thatthe best results are attained with such an instrument when theautomizing air pr sureon the brush is well over five pounds andpreferably less than twenty-five pounds.

I The effect on the glass will be as if a light dew were depositedthereon to slightly change the color of the transmitted light and togradually increase the density of the glass at this point. There isformed a fiat cloud which gradually assumes the character of a density,which can readily be observed as the operator is looking through theglass during the entire operation. Due to the finely divided characterof the pigments, the

operation is relatively slow but this permits the operator to study thelight density character of the film deposited. As but relatively smallamounts of pigments are deposited per unit of time, any undue hesitancyon the part of theoperator at a portion of the glass will not have anymaterial efiect K upon the film. During this relatively slow 3 depositof the pigments a relativelylarge amount of air is carried to the glass,which apparently has the effect of laying the pigments in asubstantially smooth-top layer and at the same time exerts a rapiddrying effect upon the film. This rapid air drying from both the passageof the air current and also from the atomizing action of the air brushhas the effect of setting the colors and there is no tendency tofiow orto form dots,

and, as a matter of fact, there is not even formed the blottedappearance characteriz ing the usual air brush painting operation.

In the commercial form of glasses this operation is continued until thedeposit is r from, approximately five ten-thousandths to threeone-thousandths of an inch in thick "uncovered portion subjected to acontinuation of this treatment, or, if desired, a different color ofpigment may be used as would probably be the case where decoratingeffect is desired, as with automobile head light glasses; i

Wlfenthe desired effect has been produced the patterns are removed andby means of a.

pointed instrument the line of demarcation is 'cut should this line bera'ggedjor any reason. The filmed. glam is thenimmersed in a plastercoating, such as powdered chalk or plaster-of-Paris, and then burned ina furnace as is usual with color fixing processes practised in thecrockery decorative frame.

art.

When cooled the clay is washed off and the Should the burning operationbe continued too long, it may be necessary, in order to save some of theglass, to polish the'same so treated are free from fine specks, are ab-I solutely uniform in color even by transmitted light and are free fromstreaks and other blemishes. By means of this process it is possible totake any prescription glass as turned out by the refractionistand colorthe same in accordance with the prescription. Glasses so treatedresemble glasses in which the coloring matter is chemically embodied inthe glass batch before it is rolled and polished.

' Commercially this process is of the greatest economic importance as itis comparatively inexpensive and is continuously under the control ofthe operator who can very quickly develop a high degree of efiiciency'in determining the exact amount of film to sential, it finds itsparticular adaptability to the goggle and lens manufacture due to therequirement of uniformly clear and transparently colored portions ofdifferent colors free from blemish which has an unpleasant effect uponthe eyes of the users. Glasses painted in the usual meanin of this term,such as by dipping and draining, by brushing .or by the indiscriminateprecipitation of a cloud of pigments thereon, are so defective inuniformity of covering as to be practically valueless for use as eyepieces.

Having thus described my invention, I claim: i

1. The process of producing clear transparent colored goggle glasses andthe like, which consists in uniformly coating the surface of the glasswith pigment in a finely atomized condition and utilizing thetransparency of the glass to determine the degree of density of suchcoating, and simultaneously drying the coatin with an independcut 3current of air, and finally fixing the dried igment coating.

2 The process of producing clear transparent colored goggle glasses andthe like,

which consists in uniformly coating the surface of the glass withpigment in afinely glass is ready to be mounted in its" atomizedcondition and utilizing thetransparency of the glass to-determine thedegree of density of such coating, and simultaneously deliveringindependently, air to volume per unit of time than the atomized pigmentto rapidly dry the pigment coating, and finally fiXin the coating.

3. The metho of making transparent colored goggle glasses which consistsin repeatedly spraying a finely atomized pigment uniformly over thesurface of the glass by the action of an excess of air pressure,

and finally fixin the deposited pigment by subjecting the g ass to heat.

4. The method of making transparent colored goggle glasses whichconsists in repeatedly spraying a finely atomized pigment uniformly overthe entlre surface of the,

glass by the action of an excess of air pres- 16 sure, then uniformlyincreasing the density of the pi ment deposited upon a defined portion 0the sur ace of the glass, and finally fixing thedeposited pigment byheat.

Signed at New York city, of New York and State of New York, this 9th dayof August, A. D. 1915. 4

JOHN U. BARR.

in the county 2t

